Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: serial: caif: hold tty->link reference in ldisc_open and ser_release A reproducer triggers a KASAN slab-use-after-free in pty_write_room() when caif_serial's TX path calls tty_write_room(). The faulting access is on tty->link->port. Hold an extra kref on tty->link for the lifetime of the caif_serial line discipline: get it in ldisc_open() and drop it in ser_release(), and also drop it on the ldisc_open() error path. With this change applied, the reproducer no longer triggers the UAF in my testing.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e31d5a05948e4478ba8396063d1e1f39880928e2 before 23a3ac2e2262a291498567418227b99e1f3606b1; affected e31d5a05948e4478ba8396063d1e1f39880928e2 before 52135420e9f75853ea0c6cea7b736e3e98495f7d; affected e31d5a05948e4478ba8396063d1e1f39880928e2 before ca2ceba983bb23ea0202c2882d963253416654a3; affected e31d5a05948e4478ba8396063d1e1f39880928e2 before 8460187b4852fd00bd1c76394358053f3fa4d089; affected e31d5a05948e4478ba8396063d1e1f39880928e2 before 27e43356d0defb9fc7fa25265219a3ffeb7b3e98; affected e31d5a05948e4478ba8396063d1e1f39880928e2 before 35b58d3bc716ebb9ebd10fe1cac8c1177242511c; affected e31d5a05948e4478ba8396063d1e1f39880928e2 before 97a0bb491cae39478c6225381f14e9ac67b7bba7; affected e31d5a05948e4478ba8396063d1e1f39880928e2 before 288598d80a068a0e9281de35bcb4ce495f189e2a |
| Linux / Linux | affected 2.6.35; unaffected 0 before 2.6.35; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.78 through 6.12.*; unaffected 6.18.19 through 6.18.*; unaffected 6.19.9 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1
- https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d
- https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3
- https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089
- https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98
- https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c
- https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7
- https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a